Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 380
e plan of the group and determinethe tetrahedron which envelops them, each face touching threespheres. 4. Draw an equilateral triangle abc of 2 side, and with a, />, c ascentres describe circles of 1, §, and ^ radii respectively.Take these circles as the plans of spheres which rest on theground,… … the ground. The inclination of the plane is then readily deter-mined by taking an elevation on a vertical plane perpendicularto the horizontal trace. 5. Take the surface of revolution of Ex. 2, p. 337, with its axis vertical and one end on the ground, and determine a planewhich shall touch the…
